Emilia Assenova

Emilia Assenova
The Society of Bulgarian Tribologists, Bulgaria, Sofia

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22
Publications
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116
Citations

Publications

Publications (22)
Article
Full-text available
The review summarises basic tribological concepts for the stability, sustainability and life of the contact systems, highlighting the idea that tribological processes are most easily manipulated through the contact and the third body. If the original contact pair does not possess a specially inserted intermediate layer between the two interacting b...
Article
Full-text available
One of the tools used within the effort of developing new quantitative scientometric tools, reliable to be used for ranking academic/research unities is the bibliometric analysis of the scientific production from discrete geographical regions on a certain scientific topic. These analyses apply the so-called bibliometric methods. In the present work...
Article
Full-text available
Different approaches are known to treat self-organization in tribosystems, related to the structural adaptation in the formation of dissipative surface structures and of frictional or tribo-films, using of synergistic modifying of layers and coatings, e.g. of the selective material transfer during friction, etc. Regarding tribological processes in...
Article
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Equipment quality and reliability improvement, and reducing environmental pollution trough tribological understanding are of the key challenges facing tribology and especially green tribology today. The paper deals with a question of huge importance in the application of tribology, namely the impact of lubricants and additives on tribological syste...
Article
Full-text available
The present paper considers wear of coatings deposited by HVOF (High velocity oxy-fuel) technology, under conditions of dry friction against abrasive surface accompanied with the action of vibrations perpendicular to the sliding axis. Results are obtained with four type coatings: two types with Ni matrix of composition 602P – without preliminary he...
Article
Full-text available
The efforts in the recent 20 years are related to search of ecological solutions in the tribotechnologies for the replacement of galvanic Cr coatings in the contact systems operating under extreme conditions: abrasion, erosion, cavitation, corrosion, shock and vibration loads. One of the solutions is in the composite coatings deposited by high velo...
Article
The paper considers a change in the coefficient of friction and the temperature distribution in the contact zone of the steel–bronze tribosystem. Investigations were carried out by the shaft–bushing system for three values of the load in the mixed-to-boundary lubrication regime with SAE 80W transmission oil without and with Valena additive. It is f...
Conference Paper
Full-text available
Wear of moulded spheroidal graphite cast iron alloyed by Sn is studied under conditions of boundary lubrication. The lubricant contains a metal-plating additive “Valena”. Five types of moulded spheroidal graphite cast iron specimens are studied with various wt. % Sn: without Sn (0 wt. % Sn), as well as with 0.018, 0.020, 0.032 and 0.051 wt. % Sn. T...
Conference Paper
Full-text available
Using the disk-abrasive roller test rig, wear behaviour of chemical Ni coatings containing boron nitride nanoparticles has been studied. The coatings were deposited by means of EFTOM-Ni technology method patented at the Technical University - Sofia. Comparative study has been done of wear resistance of the heat treated (heating during 6 h at 300˚C)...
Conference Paper
Full-text available
Tribology has always been at center of the efforts to increase reliability and quality, to reduce maintenance costs and to extend the service life of technical systems. The continuous improvement and advance technology of machines necessitate higher quality of lubricants and lubrication technologies, which influences equipment life and environment...
Article
Full-text available
The repair-regeneration oil additives are new generation additives with important place in the application of lubricants. Added to oils or greases they assure partial regeneration of worn surfaces and, at the same time, decrease the moment of friction and the coefficient of friction in the contact pairs of machines. Most common are the organic oil-...
Article
Full-text available
Wide tribology concept through the knowledge interaction from physics, chemistry and various engineering disciplines, has put tribology in a group with interdisciplinary sciences. This work gives information about the international standardization in the field of tribology, International Tribology Council, whose members consist of 36 national tribo...
Conference Paper
Full-text available
Every system is immersed in its surrounding. The changes in this interaction (contact) leading to degradation processes will affect the safety of the system. If the processes of changes are in a steady state, it can be considered that the system is safe. Sustainability includes the quality merits. Being the science and technology of the tribologica...
Article
The influence of the parameters of HVOF-technology on the quality of coatings obtained of 3 powder superalloys: 502P, SX199 and 6P50WC has been studied in the paper. Experimental results about microhardness, porosity and roughness of the three coatings under three regimes of deposition have been obtained. Optimum parameters of the supersonic system...
Article
The paper aims direct and comparative tribological studies of ten types of bimetallic coatings, obtained by different electrode material and technological regimes of arc cladding with mixed protective gas ambient. The following procedure for the tribological study has been used: wear under conditions of fixed abrasive and fixed dynamic conditions,...
Article
Full-text available
Tribology in Bulgaria began in 1963 in the form of tribo-mechanics by the Laboratory of 'Contact mechanics' established by Prof. Dr. Georgi Danov at the Technical University - Sofia. Differentiation of tribology in Bulgaria as an independent scientific area with its own subject and approach has been formally done on December 1st, 1974 when the Labo...
Article
Wide tribology concept through the knowledge interaction from physics, chemistry and various engineering disciplines, has put tribology in a group with interdisciplinary sciences. This work gives information about the international standardization in the field of tribology, International Tribology Council, whose members consist of 36 national tribo...
Article
For many years science had nothing else to say if not to show the birth of limits and borders. The paper reveals how tribology reflects the broader sense of science in general and its ability to regard things in their wholeness. The interaction of "contact systems" with the environment and the exchanged mass-, energy- and information flows make of...

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